發(fā)布時(shí)間：2018-05-03 03:21

  本文選題：多孔介質(zhì) + 顆粒�。� 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：摘要：多孔介質(zhì)中顆粒遷移特性的研究在地下水回灌、石油開采、核廢料處置、地下污染物擴(kuò)散、注漿加固和水工結(jié)構(gòu)的內(nèi)部侵蝕破壞等方面有很重要的研究意義,是當(dāng)今環(huán)境巖土工程領(lǐng)域的一個(gè)重要研究方向。 基于以上所述背景,本文結(jié)合已有的飽和多孔介質(zhì)中顆粒遷移問題的研究現(xiàn)狀,利用自行研制的試驗(yàn)裝置,對(duì)飽和多孔介質(zhì)中顆粒遷移特性進(jìn)行試驗(yàn)研究,主要研究?jī)?nèi)容包括試驗(yàn)研究和機(jī)理分析兩方面。 首先,通過試驗(yàn)計(jì)算得出水中顆粒濃度和濁度的關(guān)系,摒棄以往研究中經(jīng)常采用的過程復(fù)雜、效率低下的過濾稱重法,改為采用通過濁度測(cè)定顆粒濃度的方法；其次,開展不同的顆粒粒徑、顆粒濃度、滲流速度、滲流方向等情況下顆粒遷移的室內(nèi)土柱系列試驗(yàn),得出飽和多孔介質(zhì)中懸浮顆粒在6種不同顆粒粒徑(D50=10μm,15μm,20μm,25μm,33μm,47μm)、3種不同顆粒濃度(0.2mg/ml,0.5mg/ml,0.8mg/ml)、3種不同滲流速度(0.087cm/s,0.173cm/s,0.260cm/s)、3種不同滲流方向(自上向下,水平,自下向上)等條件下的顆粒穿透曲線；最后,通過對(duì)試驗(yàn)結(jié)果進(jìn)行綜合的對(duì)比和深入的分析,探究顆粒粒徑、顆粒濃度、滲流速度、滲流方向等物理因素對(duì)于飽和多孔介質(zhì)中顆粒遷移特性的影響。 由試驗(yàn)結(jié)果分析可知,顆粒粒徑、顆粒濃度、滲流速度、滲流方向等物理因素均會(huì)對(duì)飽和多孔介質(zhì)中顆粒遷移特性產(chǎn)生很大影響；同時(shí)各種物理因素又是一個(gè)有機(jī)的整體因素,是相互聯(lián)系、相輔相成的,某一種物理因素的改變?cè)谟绊懼w粒遷移的同時(shí),也會(huì)促使其他物理因素對(duì)顆粒遷移特性的影響發(fā)生改變。
[Abstract]:Abstract: the study of particle migration characteristics in porous media is of great significance in groundwater recharge, petroleum exploitation, nuclear waste disposal, underground pollutant diffusion, grouting reinforcement and internal erosion and destruction of hydraulic structures. It is an important research direction in the field of environmental geotechnical engineering. Based on the above mentioned background, combining with the existing research status of particle migration in saturated porous media, the characteristics of particle migration in saturated porous media are studied by using a self-developed experimental device. The main research contents include experimental research and mechanism analysis. First, the relationship between particle concentration and turbidity in water is obtained by experimental calculation. The filtration weighing method, which is often used in previous studies, is replaced by the method of measuring particle concentration through turbidity. Laboratory soil column series tests with different particle size, particle concentration, percolation velocity, seepage direction and so on were carried out. The results show that the suspended particles in saturated porous media have three different percolation velocities of 0.087 cms0.173 cms0.176 cms0.260 cms-1 / 3 different percolation directions (from top down, level, from bottom up) to three different percolation directions (from top down, level up, from bottom up) to three different percolation directions (from top down, level, from bottom up) to three different percolation speed of suspended particles in saturated porous media. Through the comprehensive comparison and in-depth analysis of the experimental results, the effects of particle size, particle concentration, seepage velocity and seepage direction on the particle migration characteristics in saturated porous media are explored. The experimental results show that the particle size, particle concentration, percolation velocity, seepage direction and other physical factors have great influence on the particle migration in saturated porous media, and all kinds of physical factors are an organic whole factor. The change of one kind of physical factors not only affects particle migration, but also impels other physical factors to change the particle migration characteristics.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU43;TU411

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本文編號(hào)：1836752